The whole idea of soulmarks is that they’re there to tell you about the most important person in your life. They’re supposed to indicate the most important conversation you’ll ever have with your soulmate (a lot of people have ‘I love you’. A lot of people have ‘I need to tell you something’. A lot of people have ‘I’m seeing someone else’.)
That’s all well and good, except it still doesn’t explain why xe has titties in blocky, uneven script over xir sternum. Right in between xir titties.